Boiler



H. V. WILLE.

Boum.

APPLICATXQN FILED MAY 9, |917.

Patented D00. 28,1920.

2SHEETSSHEET I.

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APPLICATION FILED MAY9. 1917.

1,363,944, Patented Dec. 28, 1920.

UNITED STATES PATENT OFFICE.

HENRY V. WILLE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO-TI-IE :BALDWIN LOCOMOTIVE WORKS, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA.

BOILER.

lSpecification of Letters Patent.

Patented Dec. 28, 1920.

Application filed May 9, 1917. Serial No. 167,445.

To all 'whom t may concern.'

Be it known that I, HENRY V. l/VILLE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Boilers, of which the following is a specification.

Hy invention relates to certain improvements in the manufacture of boilers having flanged heads, particularly of the locomotive type in which the back head of the fire box, as well as the rear top sheet, is flanged and is secured to the crown sheet and to the side walls of the fire box by welding. In this type of boiler there is also a welded joint between the extension of the combustion chamber and the fire box.

The object of the invention is to design the boiler so that the back fire box head and the rear tube sheet will have a deeper flange than heretofore so that the weld will be between the rst and second rows of stay bolts, and also to design the other parts where the weld is located so that both sheets are supported by stay bolts.

In the accompanying drawings:

Figure 1 is a longitudinal sectional view of the rear portion of a locomotive boiler illustrating my invention;

Fig. 2 is a detached perspective view of the back fire box head showing a row of stay bolt holes in the flange, the stay bolt holes in the body of the sheet being omitted to avoid confusion; and

Fig. 3 is a perspective view of the rear tube sheet showing the flange perforated for a row of stay bolts.

I-Ieretofore, it was the common practice to flange the back fire box head, as well as the rear tube sheet, and to attach the flanges to the body portion of the fire box by rivets, then, when the welding was perfected, these flanges were butt-welded against the sides of the crown sheet and the fire box, but, in every instance, the weld was beyond the line of stay bolts which connected the wall of the fire box structure with the outer wall of the boiler, therefore, great care had to be exercised in properly making the head, as the joint was supported wholly by the stay bolts on one side of the weld.

By my invention, both the flange and the body portion of the re box structure are supported by a row of stay bolts, thus reducing considerably the strain on the flanged portion of the back head of the fire box and the rear tube sheet.

Referring to the drawings, 1 is the main shell of the boiler at the fire box. 2 is the back boiler head. 3 is the barrel of the boiler having a flanged section 4 at the bottom. 5 is the mud ring extending around the base of the fire box structure of the boiler. 6 is a side wall of the fire box. 7 is the crown sheet. 8 is the front flange paralleling the portion 4 of the barrel. 9 is the rear tube sheet and 10 is the back fire box head.

In the present instance, the fire box 11 has a deep combustion chamber 12 at the forward end of which is the rear tube sheet. The back has a deep flange 9 shown clearly in Fig. 3. This rear tube sheet is welded to the body of the combustion chamber 12 on the line w between the first row of stay bolts 13 and the second row of stay bolts 14. The back fire box head has a deep flange 10a, as clearly shown in Fig. 2, and is welded to the body portion of the fire box on the line y between the first row of stay bolts 15 at the rear of the body portion and the second row of stay bolts 16.

It will be noticed, upon referring to Fig. 3, that there is a line of stay bolt holes in the flange 9a of the rear tube sheet 9 and that there is also a row of stay bolt holes in the flange 10l of the back fire box head 10. This fire box structure is first welded and is then mounted in the rear of the locomotive boiler and the stay bolts are located at certain intervals at each side, connecting the shell of the lire box with the shell of the boiler, consequently, the first row of stay bolts at the rear tube, as well as the first row of stay bolts at the back head of the fire box, take the greater portion of the strains to which these parts are subjected, therefore, the liability of straining the welded joints is materially reduced.

In addition to the joints above described, there is a joint at the point where the main fire box structure 11 is united with the extended combustion chamber 12. The main weld is on the line w and is located between the first row of stay bolts 17 and the second row of stay bolts 18 at the point where the stay bolts of the fire box proper unite with the shaped plates 12a forming the rear end of the combustion chamber 12. There is also a right angled weld, as indicated at e, y

lrow of stay bolts and on the other side by a row of stay bolts which take a certain proportion of the strain heretofore borne entirely by the weld.

I have not shown the long stays for the back and, in fact, I have omitted from the drawings all unnecessary details which do not relate to the present invention.

Vhile I have illustrated the invention as applied to a boiler of the locomotive type, it will be understood that it can be used in connection with any type of boiler having flanged heads and in which stay bolts are used to connect the fire boX and the combustion chamber with the main shell of the boiler.

I claim:

1. The combination in a boiler, of a main shell; a back boiler head; a fire boX having 'side walls; a crown sheet; a back head having a deep flange secured by welding to the crown sheet and forming the fire box; a series of rows of stay bolts securing the fire box to the main shell of the boiler, one series of stay bolts being secured to the deep flange of the back head so that the welded joint is between the first and second rows of stay bolts.

2. A boiler having in combination inner and outer shells; a back-head and a rear tube sheet7 said head and sheet each having a deep flange provided with a row of staybolt holes; a welded joint between the flanges of said head and tube sheet and the adjacent portions of the inner sheet; and a plural series of rows of stay bolts, one row of said bolts fitting the holes in the flanges of said head and tube sheet respectively at one side of the weld, and other rows of said bolts fitting corresponding holes in the adjacent portions of the inner shell at the opposite side of the weld thereby localizing each weld between two rows of stay bolts and relieving the weld from excessive strains.

In witness whereof I afiiX my signature HENRY V. WILLE. 

